Teaching tool



FIG. 1 is a front elevational view of a teaching tool showing my new design;

FIG. 2 is a right side elevational view;

FIG. 3 is a left side elevational view;

FIG. 4 is a rear elevational view;

FIG. 5 is a top plan view;

FIG. 6 is a bottom plan view;

FIG. 7 is a vertical cross-sectional view taken on lines 7--7 of FIG. 1; and

FIG. 8 is a front perspective view thereof. 

The ornamental design for a teaching tool, as shown and described. 